Furnace



Dec. 721926. 1 1,609,561

C. W. LISTERMAN FURNACE Filed May 4 1925 3 INVENTOR. Chan W. Liscevman ATTORNEY.

Patented Dec. 7, 1926.

- UNITED STATES CHARLES w. LISTERMAN,

PATENT OFFICE.

OF LA'roNrA, KENTUCKY,

FURNACE.

Application filed May 4,

My invention relates to the construction of furnaces and is particularly adapted for use in connection with hot-air furnaces, hotescaping through the front of the furnace casing when the furnace grate is shakenor the bed of coals within the fire-pot is otherwise a itated, whereby the dust and fine ashes thereby produced in the ash pit are adapted to float therefrom into the atmosphere surrounding the furnace and cause considerable annoyance to persons in the furnace room, as well as producing an undesirable accumulation of dirt upon the furnace and surrounding objects. Coal-ash dust is extremely fine and has a very low specific gravity whereby it is readily capable of being carried by currents of air into apartments and living quarters located above a furnace room. This is especlally undesirable and disagreeable to persons living therein, particularly during winter months when the windows and doors are tightly closed. Ordinarily, an accumulation of ashes that lay upon the grate of furnace .fire-pot is sifted through the grateinto the ash-pit for the purpose of providing a free circulation of air from. the ash-pit through the fire-pot furnace and thence into the smoke exit pipe and flue for the purpose of accomplishing a rapid combustion of the coal within the fire-pot. However, unless practically all of the accumulated ash is sifted through the grate the draft is incapable of carrying the fine floating ash and dust from the ash-pit into the fire pot. This is true particularly when a front door of the ash-pit is open and previous to rapid combustion within the fire pot producing a forced draft, whereby a considerable quantity of the ash dustis permitted to escape from the ash-pit into the furnace room.

The objects of my invention are to pro videsimple, economical, effective and conveniently operated meansfor conveying the ash dust from the ash-pit into the flue, thereby preventing said dust from escaping into the furnace room when the furnace grate is shaken or the ashes within either the fire pot or the ash-pit are otherwise agitated; to provide conveniently o erated means adapted to open and close t e ens- 1925. Serial No. 27,784,

iliary piped passage leading from the asl1 pit into the smoke exit pipe; and to provide a construction whereby said auxiliary passage can be quickly and conveniently cleaned.

My invention consists in providing a piped passage leading from the rear of the ash-pit of a furnace into the smoke exit means whereby saidpassage can be convenlently closed and opened; and 111 providing a manually operative trap door connected with said passage whereby convenient access may be gained for cleaning said passage.

' My invention further consists in the construction,'combination and arrangement of parts, as herein set forth and claimed.

In the drawing: I Fig. 1 is a central front to rear vertical section of a furnace having my invention incorporated therein;

Fig. 2 is a perspective view of a combination union and sliding valve;

- Fig. 8 is a section taken on a plane corresponding to-line 33 in Fig.1 and showing the valve in open position; and

Fig. at is a perspective view of the valve,

1 slide or shutter.

exit 2 of fire-pot 2 leads into usual circularly extending tubular pipe I 8 through which smoke and gases pass from the fire pot into smoke exit pipe 10 combinedly connected in a usual manner with pipe 8 and flue 11. End 10 of pipe 10 extends up wardly in flue 11 whereby an upward draught is produced in the flue. Beneath fire pot 2 is usual ash-pit 9 having usual front draft door 12 hingedly connected to ash-pit door 13 hingedly connected to the front of ash-pit casing 14 extending through the front of easing 3 of the furnace. WVhen usual mechanism is actuated for shaking and agitating grate 15, suitably secured'in the bottom of fire-pot 2, ashes are sifted through the grate into the ash-pit whereby the fine ashes and dust are adapted to float outwardly through the front open ashpit casing 1 1 when either or both in providing manually operative the draft door 12 or ash-pit door 13 is open or insecure-iv closed.

In the preferred construction of my invention I provide ash-pit casing 1a with opening 16 in its rear side 17; The open ing 16 in the ash-pit casing has inner end 18 of pipe 19 titted therein and extending rearwardly and at a slight angle upwardly. The outer end 20 of pipe 19 has trap door 21 liinpedly connected thereto for the purpose of providing convenient access into dust pipe 19 for cleaning purposes. Vertically extending dust pipe 22 has its upper and lower ends 23 and 23', respectively, connected to openings 2} and 25, respectively in smoke exit pipe 10 and dust exit pipe 19 whereby a direct draft and auxiliary passage is obtained from ash-pit 9 into flue 11 for the purpose of conveying the dust from the ash-pit into the flue irrespective of the passage which leads from the asl-npit into the flue through the fire pot 2. Fixed to the lower side of smoke exit pipe 10 is combination union 26 having hole 26" therein in registering position with hole 24 in the smoke exit pipe 10.

Manually operative handle 27 fixed to end 28 of slide 29 slidably mounted in slots 30 in combination with union 2G is for the purpose of closing opening 24, thereby closing the auxiliary passage leading from ash-pit 9 through pipes 19 and 22 into the smoke exit pipe, wherebv the usual effective draft is produced from the ash-pit through firepot 2, pipe 8, smoke exit pipe 10 and into tine 11. Intermediate vertical pipe 22 and tine 11 is opening 31 in the lower part of smoke exit pipe 10 whereby accumulation of dirt, dust, soot, and other substances may be conveniently removed from the smoke exit pipe. The opening 31 is closed by door 32 suitably slidably mounted in the smoke pipe.

The mechanical operations of my invention are as follows:

Previous to shakiniz the ashes from the pot 2 through grate into ash-pit 9 the trap door 21 is closed and valve 29 is moved to open position, (as shown in Figs. 2 and 3) as by manual operation of handle 27 whereby the auxiliary passage leading from ashpit 9 to flue it. and formed by pipes 19, and 10 is adapted to carry the floating dust and other substances from the ash-pit into the flue without the necessity of being carried through tire-pot 2 and pipe 8. After the desired quantity of ashes are shaken from the fire-pot into the ash pit and the dust thereby produced is carried into the flue the handle 27 is manually;

operated for actuating valve 20 in closed osition over end 23 of pipe 22 whereby the draft through fire-pot 2 and into flue 11 is reestablished without being affected by the auxiliary passage through pipes 19 and 22.

It is apparent that I have invented a simple, effective and highly desirable device for the purpose intended and by which it is possible to entirely eliminate dust arising: from the ash-pit into the furnace room when ashes are shaken from the fire-pot into the ash pit.

An advantage of my invention is that its operation is comparatively simple and its construction is economical, hen my invention is installed once its durability extends practically over an indefinite period of time and as it will considerably outlast an ordinary furnace, it may be reinstalled in connection with the various furnaces which are substituted for older ones from time to time.

Another advantage of my invention is that it may be incorporated in the construction of any usual and already installed furnace, if desired, without interfering in any way with the operation of the furnace.

lVhile I have chosen to illustrate the form and construction of my invention by the acconiipanying drawings and explanation of the same, I desire to emphasize the fact that the form and explanations, as relates thereto, are not intended to include all of the structures in which my invention may be incorporated. It is, therefore, understood that my invention resides in the combination, arrangement and location of parts and in the details of construction, as herein claimed and that changes in the precise embodiment of the invention canbe made within the scope of what is claimed Without departing from the spirit of the invention. 7

\Vhat I claim as new and desire to secure by Letters Patent is:

In combination with a furnace having a smoke pipe and ash-pit, a dust pipe having an outwardly and upwardly extending section from said ash-pit and partly out side of the fin-inure. an upwardly extending section outside of the furnace connecting said outwardly extending section with said smoke pipe, a door in the end of said outwardly extending section whei eby said dust pipe may be cleaned, and a valve in the upper end of said dust pipe adjacent said smoke pipe whereby the draft through the fire-pot into the flue is established without being affected by said dust pipe.

CHARLES TV; LISTEBMAN.

IOU

IIS 

